Upgrading the Memory on the OSM

Safety

Safety warnings appear throughout this section in procedures that may harm you if performed incorrectly. A warning symbol precedes each warning statement.

Warning This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.

Wrist Strap Warning

Warning

During this procedure, wear grounding wrist straps to avoid ESD damage to the card. Do not directly touch the backplane with your hand or any metal tool, or you could shock yourself. Statement 94

Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment.

Warning Hazardous voltage or energy is present on the backplane when the system is operating. Use caution when servicing.

Required Tools

These tools are required to upgrade the memory on the OSM:

•Antistatic mat or foam pad

•Number 1 Phillips screwdriver

•3/16-inch flat-blade screwdriver

•Your own ESD-prevention equipment or the disposable grounding wrist strap included with all upgrade kits, field-replaceable units (FRUs), and spares

Whenever you handle a module or supervisor engine, always use a wrist strap or other grounding device to prevent electrostatic discharge (ESD). For information on preventing ESD, see the "Preventing ESD" section of the Site Preparation and Safety Guide.

Upgrading the OSM Memory

This section provides the procedures for removing and replacing the memory on the OSM.

The synchronous dynamic random-access memory (SDRAM) on the OSM is contained in one small outline dual inline memory module (SODIMM). (See Figure C-1.)

The OSM has a default memory configuration of 64 MB with Error Checking and Correction (ECC) (single-bit error detection and correction; 2-bit error detection) and is upgradable to 128 MB, 256 MB, or 512 MB.

Note You should use only 100-MHz SDRAM SODIMMs. A Cisco part number appears on the SODIMMs.

Caution To prevent ESD damage, handle the SODIMM by the card edges only. (See
Figure C-3.) Place the removed SODIMM on an antistatic mat or store it in an antistatic container.

Removing the SODIMM

Warning Hazardous voltage or energy is present on the backplane when the system is operating. Use caution when servicing.

To remove the existing SODIMM,follow these steps:

Step 1 Make sure you take the necessary precautions to prevent ESD damage.

Step 5 Release the spring clips from the SODIMM that you want to remove, and release the SODIMM from the socket. (See Figure C-2.)

Figure C-2 Releasing the SODIMM Spring Clips

Step 6 When both ends of the SODIMM are released from the socket, grasp the ends of the SODIMM with your thumb and forefinger and pull the SODIMM completely out of the socket. Handle the edges of the SODIMM only; avoid touching the memory modules, pins, or traces (the metal fingers along the connector edge of the SODIMM) along the connector edge.

Step 7 Place the SODIMM in an antistatic container to protect it from ESD damage.

This completes the SODIMM removal procedure. Proceed to the next section to install the new SODIMM.

Installing the New SODIMM

Caution SODIMMs are sensitive components that are susceptible to ESD damage. Handle SODIMMs by the edges only; avoid touching the memory modules, pins, or traces (the metal
fingers along the connector edge of the SODIMM). (See
Figure C-3.)

Figure C-3 Handling a SODIMM

To install the new SODIMM, follow these steps:

Step 1 Remove a new SODIMM from the antistatic container.

Step 2 Hold the SODIMM component-side-up, with the connector edge (the metal fingers) away from you.

Step 3 Hold the sides of the SODIMM between your thumbs and forefingers. (See Figure C-3.)

Step 4 Tilt the SODIMM to approximately the same angle as the socket, and insert the connector edge into the socket.

Caution When inserting SODIMMs, use firm but not excessive pressure. If you damage a socket, you will have to return the OSM to the factory for repair.

Step 5 Press the SODIMM down until it is secured by the spring clips.

Step 6 When the SODIMM is installed, check the two alignment holes and ensure that the spring retainer is visible. If it is not, the SODIMM is not seated properly. If any SODIMM appears misaligned, carefully remove it and reseat it in the socket. Push the SODIMM firmly back into the socket until the spring clips snap into place.